NAME
sigset —
manipulate signal
dispositions
LIBRARY
library “libc”
SYNOPSIS
#include
<signal.h>
void (*
sigset(int
sig, void
(*disp)(int)))(int);
DESCRIPTION
The
sigset()
function manipulates the disposition of the signal
sig. The new disposition is given in
disp.
If disp is one of
SIG_DFL, SIG_IGN, or the
address of a handler function, the disposition of sig
is changed accordingly, and sig is removed from the
process' signal mask. Also, if disp is the address of
a handler function, sig will be added to the process'
signal mask during execution of the handler.
If disp is equal to
SIG_HOLD, sig is added to the
calling process' signal mask and the disposition of
sig remains unchanged.
RETURN VALUES
If successful, the sigset() function
returns SIG_HOLD if sig had
been blocked, and the previous disposition of sig if
it had not been blocked. Otherwise SIG_ERR is
returned and errno is set to indicate the error.
ERRORS
The sigset() function will fail if:
- [
EINVAL] - The argument sig is not a valid signal number; or an
attempt is made to ignore a signal that cannot be ignored, such as
SIGKILLorSIGSTOP.
SEE ALSO
STANDARDS
The sigset() function conforms to
IEEE Std 1003.1-2001 (“POSIX.1”). It
was however marked as obsolete in the IEEE Std 1003.1-2008
(“POSIX.1”) revision of the standard.